Microsoft has updated the web version of Word to include a built-in PDF viewer. Any PDF files from your email or stored on SkyDrive can be viewed directly within the app, or the text extracted into a new Word document for editing.
This isn't likely to appeal to Chrome users, who already have native PDF viewing built in. However, if you're on a locked down machine and don't want the hassle of launching a separate viewer, or if you regularly work in the web version of Word anyway, this is a handy addition. It also works from Outlook Web Access, although a bug means it doesn't work on Sharepoint sites at the moment.
PDFs in the Word Web App [Office Web Apps]